US20140085860A1 - Light guide module for keypad - Google Patents
Light guide module for keypad Download PDFInfo
- Publication number
- US20140085860A1 US20140085860A1 US13/914,833 US201313914833A US2014085860A1 US 20140085860 A1 US20140085860 A1 US 20140085860A1 US 201313914833 A US201313914833 A US 201313914833A US 2014085860 A1 US2014085860 A1 US 2014085860A1
- Authority
- US
- United States
- Prior art keywords
- light guide
- plate
- sided tape
- double sided
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9627—Optical touch switches
- H03K17/9629—Optical touch switches using a plurality of detectors, e.g. keyboard
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9627—Optical touch switches
- H03K17/9631—Optical touch switches using a light source as part of the switch
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9627—Optical touch switches
- H03K17/9638—Optical touch switches using a light guide
Definitions
- the present disclosure relates to light guide structures, and particularly to a light guide module for a keypad in a portable electronic device.
- keypads are illuminated using light sources, light guide plates and some optical elements.
- the light guide plates and the optical elements are spaced from each other and are sandwiched between a touch plate and an induction plate.
- the distance between the touch plate and the induction plate increases. If the distance between the touch plate and the induction plate is too great, the touch plate might not be sensitive. Additionally, the distance between the optical elements and plates may make the keypad too thick for installation within the portable electronic device.
- FIG. 1 is an isometric view of an exemplary electronic device using a light guide module.
- FIG. 2 is a schematic view of a first exemplary light guide module shown in FIG. 1 .
- FIG. 3 is an exploded view of the light guide module shown in FIG. 2 .
- FIG. 4 is a schematic view of a second exemplary light guide module shown in FIG. 1 .
- FIG. 1 shows a light guide module 100 , which can be used in a portable electronic device 500 , such as a cellular phone or any electronic device where a touch keypad is required.
- the portable electronic device 500 includes a display 300 .
- the light guide module 100 and the display 300 are spaced apart in the portable electronic device 500 . Users can input an instruction to control the portable electronic device 500 using a finger or a touch tool to touch the light guide module 100 .
- FIG. 2 shows a first exemplary embodiment of the light guide module 100 .
- the light guide module 100 includes a touch plate 10 , a transparent double sided tape 20 , a light guide plate 30 , a reflective double sided tape 40 , an induction plate 50 , and a light source 60 .
- the touch plate 10 , the transparent double sided tape 20 , the light guide plate 30 , the reflective double sided tape 40 and the induction plate 50 are positioned in that order.
- the light source 60 is located on the induction plate 50 and faces the touch plate 10 .
- the light guide plate 30 transmits light emitted from the light source 60 to the touch plate 10 .
- the touch plate 10 is made of a transparent material such as plastic.
- the plastic material can be any of polycarbonate (PC) and polymethyl methacrylate (PMMA).
- the touch plate 10 includes a first surface 102 and a second surface 104 .
- the first surface 102 is used by the user for touching.
- the second surface 104 has a plurality of key icons (not shown) and a plurality of shaded portions surrounding the key icons.
- the key icons have partially transmissive portions and can be illuminated when light from the light source 60 is transmitted to the touch plate 10 .
- the light guide plate 30 is positioned under the touch plate 10 and is made of a transparent material such as glass or plastic.
- the plastic material can be any of PC, polyethylene terephthalate (PET), PMMA.
- One surface of the light guide plate 30 includes a plurality of micro dots 32 .
- the micro dots 32 are spaced from each other.
- the density and size of the micro dots 32 vary as the distance of the micro dots 32 relative to the light source 60 changes.
- the micro dots 32 adjacent to the light source 60 have a smaller density and a smaller size.
- the arrangement of the micro dots 32 scatter and reflect more light toward the touch plate 10 .
- the micro dots 32 may be concave or convex and may be formed by etching.
- the induction plate 50 may be a printed circuit board (PCB), flexible printed circuit board (FPCB), or indium tin oxide (ITO) type PCB.
- the induction plate 50 has a plurality of detecting areas corresponding to the key icons on the touch plate 10 . When user touches a position on the touch plate 10 , the corresponding detecting area of the induction plate 50 can detect a touch position coordinate made by the user, and produce a corresponding command signal to the electronic device.
- the transparent double sided tape 20 is used for adhering the touch plate 10 and the light guide plate 30 .
- the transparent double sided tape 20 is adhered to the second surface 104 of the touch plate 10 and another surface of the light guide plate 30 without the micro dots 32 .
- the reflective double sided tape 40 is adhered to the surface of the light guide plate 30 with the micro dots 32 and the induction plate 50 .
- the color of the reflective double sided tape 40 is silver and can reflect the light emitting from the light source 60 toward the light guide plate 30 , to achieve a planar light source having uniform brightness.
- the reflective double sided tape 40 functions mainly as a reflective element, to ensure that most of the light emitted from the light source 60 enter the light guide plate 30 .
- the light source 60 can be light emitting diodes (LED) and is mounted on one side of the induction plate 50 .
- the light source 60 is located between the induction plate 50 and the touch plate 10 and is positioned at one side of the transparent double sided tape 20 , the light guide plate 30 and the reflective double sided tape 40 .
- the light source 60 is used for providing light to the light guide module 100 .
- the emitted light of the light source 60 is guided by the reflective double sided tape 40 to the light guide plate 30 , and then, the light is reflected by the reflective double sided tape 40 to penetrate through the light guide plate 30 .
- the micro dots 32 scatter and reflect more light toward the transparent double sided tape 20 and the touch plate 10 .
- the light passes through the transparent double sided tape 20 to illuminate the second surface 104 of the touch plate 19 .
- the key icons are shown on the first surface 102 of the touch plate 10 .
- the present light guide module 100 uses the transparent double sided tape 20 and the reflective double sided tape 40 to reduce the distance between the touch plate 10 and the induction plate 50 .
- the touch keypad is more sensitive and more easily to be operated.
- the light guide module 200 includes a touch plate 210 , a transparent double sided tape 220 , a light guide plate 230 , a reflective double sided tape 240 , an induction plate 250 , and two light sources 260 .
- the touch plate 210 , the transparent double sided tape 220 , the light guide plate 230 , the reflective double sided tape 240 , and the induction plate 25 are similar to the elements of the first exemplary embodiment, herein are not detailed.
- the difference of the second exemplary embodiment relative to the first exemplary embodiment is that the light guide module 200 includes the two light sources 260 adjacent to each other.
- the light sources 260 are used for providing light to the light guide module 200 .
Abstract
Description
- 1. Technical Field
- The present disclosure relates to light guide structures, and particularly to a light guide module for a keypad in a portable electronic device.
- 2. Description of Related Art
- In portable electronic devices, keypads are illuminated using light sources, light guide plates and some optical elements. In a touch type keypad field, the light guide plates and the optical elements are spaced from each other and are sandwiched between a touch plate and an induction plate. As the distance between the light guide plates and the optical elements increases, the distance between the touch plate and the induction plate also increases. If the distance between the touch plate and the induction plate is too great, the touch plate might not be sensitive. Additionally, the distance between the optical elements and plates may make the keypad too thick for installation within the portable electronic device.
- Therefore, there is room for improvement within the art.
- Many aspects of the embodiments can be better understood with references to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present light guide module. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
-
FIG. 1 is an isometric view of an exemplary electronic device using a light guide module. -
FIG. 2 is a schematic view of a first exemplary light guide module shown inFIG. 1 . -
FIG. 3 is an exploded view of the light guide module shown inFIG. 2 . -
FIG. 4 is a schematic view of a second exemplary light guide module shown inFIG. 1 . -
FIG. 1 shows alight guide module 100, which can be used in a portableelectronic device 500, such as a cellular phone or any electronic device where a touch keypad is required. The portableelectronic device 500 includes adisplay 300. Thelight guide module 100 and thedisplay 300 are spaced apart in the portableelectronic device 500. Users can input an instruction to control the portableelectronic device 500 using a finger or a touch tool to touch thelight guide module 100. -
FIG. 2 shows a first exemplary embodiment of thelight guide module 100. Thelight guide module 100 includes atouch plate 10, a transparent doublesided tape 20, alight guide plate 30, a reflective doublesided tape 40, aninduction plate 50, and alight source 60. Thetouch plate 10, the transparent doublesided tape 20, thelight guide plate 30, the reflective doublesided tape 40 and theinduction plate 50 are positioned in that order. Thelight source 60 is located on theinduction plate 50 and faces thetouch plate 10. Thelight guide plate 30 transmits light emitted from thelight source 60 to thetouch plate 10. - The
touch plate 10 is made of a transparent material such as plastic. The plastic material can be any of polycarbonate (PC) and polymethyl methacrylate (PMMA). Thetouch plate 10 includes afirst surface 102 and asecond surface 104. Thefirst surface 102 is used by the user for touching. Thesecond surface 104 has a plurality of key icons (not shown) and a plurality of shaded portions surrounding the key icons. The key icons have partially transmissive portions and can be illuminated when light from thelight source 60 is transmitted to thetouch plate 10. - The
light guide plate 30 is positioned under thetouch plate 10 and is made of a transparent material such as glass or plastic. The plastic material can be any of PC, polyethylene terephthalate (PET), PMMA. One surface of thelight guide plate 30 includes a plurality ofmicro dots 32. Themicro dots 32 are spaced from each other. The density and size of themicro dots 32 vary as the distance of themicro dots 32 relative to thelight source 60 changes. In the exemplary embodiment, themicro dots 32 adjacent to thelight source 60 have a smaller density and a smaller size. As the distance of themicro dots 32 relative to thelight source 60 increases, the density and the size of themicro dots 32 increases. The arrangement of themicro dots 32 scatter and reflect more light toward thetouch plate 10. Themicro dots 32 may be concave or convex and may be formed by etching. - The
induction plate 50 may be a printed circuit board (PCB), flexible printed circuit board (FPCB), or indium tin oxide (ITO) type PCB. Theinduction plate 50 has a plurality of detecting areas corresponding to the key icons on thetouch plate 10. When user touches a position on thetouch plate 10, the corresponding detecting area of theinduction plate 50 can detect a touch position coordinate made by the user, and produce a corresponding command signal to the electronic device. - The transparent double sided
tape 20 is used for adhering thetouch plate 10 and thelight guide plate 30. In this exemplary embodiment, the transparent doublesided tape 20 is adhered to thesecond surface 104 of thetouch plate 10 and another surface of thelight guide plate 30 without themicro dots 32. - The reflective double
sided tape 40 is adhered to the surface of thelight guide plate 30 with themicro dots 32 and theinduction plate 50. The color of the reflective doublesided tape 40 is silver and can reflect the light emitting from thelight source 60 toward thelight guide plate 30, to achieve a planar light source having uniform brightness. The reflective doublesided tape 40 functions mainly as a reflective element, to ensure that most of the light emitted from thelight source 60 enter thelight guide plate 30. - The
light source 60 can be light emitting diodes (LED) and is mounted on one side of theinduction plate 50. Thelight source 60 is located between theinduction plate 50 and thetouch plate 10 and is positioned at one side of the transparent doublesided tape 20, thelight guide plate 30 and the reflective doublesided tape 40. Thelight source 60 is used for providing light to thelight guide module 100. - In use, the emitted light of the
light source 60 is guided by the reflective doublesided tape 40 to thelight guide plate 30, and then, the light is reflected by the reflective doublesided tape 40 to penetrate through thelight guide plate 30. Themicro dots 32 scatter and reflect more light toward the transparent doublesided tape 20 and thetouch plate 10. Finally, the light passes through the transparent doublesided tape 20 to illuminate thesecond surface 104 of the touch plate 19. Thus, the key icons are shown on thefirst surface 102 of thetouch plate 10. The presentlight guide module 100 uses the transparent doublesided tape 20 and the reflective doublesided tape 40 to reduce the distance between thetouch plate 10 and theinduction plate 50. The touch keypad is more sensitive and more easily to be operated. - In a second exemplary embodiment, referring to
FIG. 4 , thelight guide module 200 includes atouch plate 210, a transparent doublesided tape 220, a light guide plate 230, a reflective double sided tape 240, aninduction plate 250, and twolight sources 260. Thetouch plate 210, the transparent doublesided tape 220, the light guide plate 230, the reflective double sided tape 240, and the induction plate 25 are similar to the elements of the first exemplary embodiment, herein are not detailed. The difference of the second exemplary embodiment relative to the first exemplary embodiment is that thelight guide module 200 includes the twolight sources 260 adjacent to each other. Thelight sources 260 are used for providing light to thelight guide module 200. - It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that different changes may be made thereto without departing from the spirit and scope of the present disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the present disclosure.
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2012103573171 | 2012-09-24 | ||
CN201210357317.1A CN103672741A (en) | 2012-09-24 | 2012-09-24 | Light guide module and electronic device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140085860A1 true US20140085860A1 (en) | 2014-03-27 |
Family
ID=50311091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/914,833 Abandoned US20140085860A1 (en) | 2012-09-24 | 2013-06-11 | Light guide module for keypad |
Country Status (3)
Country | Link |
---|---|
US (1) | US20140085860A1 (en) |
CN (1) | CN103672741A (en) |
TW (1) | TW201413770A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104917865A (en) * | 2015-06-08 | 2015-09-16 | 武汉华星光电技术有限公司 | Mobile terminal and display screen thereof |
US10698509B2 (en) | 2015-07-24 | 2020-06-30 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Display screen assembly, terminal front cover, and terminal |
US11941216B1 (en) * | 2023-05-09 | 2024-03-26 | Primax Electronics Ltd. | Touch pad with key input function |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104035620B (en) * | 2014-06-20 | 2018-09-07 | 深圳印象认知技术有限公司 | Optical sensor key, touch screen, fingerprint collecting equipment, electronic equipment |
CN104158532A (en) * | 2014-07-25 | 2014-11-19 | 广东好帮手电子科技股份有限公司 | Touch key device for rear-view mirror glass of vehicle navigation |
TWI607475B (en) * | 2015-06-05 | 2017-12-01 | 達方電子股份有限公司 | Backlight module and lighting keyboard using the same |
CN105955517A (en) * | 2016-06-17 | 2016-09-21 | 联想(北京)有限公司 | Touch board and electronic device |
CN114543019B (en) * | 2022-01-28 | 2024-04-12 | 赛尔富电子有限公司 | Touch mirror lamp for hidden microwave movement detection |
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US20070189040A1 (en) * | 2004-10-09 | 2007-08-16 | Chul-Goo Chi | Light guide plate for liquid crystal display back light units and liquid crystal display back light unit using the same |
US20080129701A1 (en) * | 2006-12-01 | 2008-06-05 | Takahiro Murakami | Input device equipped with illumination mechanism |
US7466379B2 (en) * | 2005-02-14 | 2008-12-16 | Sony Corporation | Display apparatus |
US20100321298A1 (en) * | 2009-06-17 | 2010-12-23 | Sunrex Technology Corp. | Keyboard and touchpad combination |
US20110181809A1 (en) * | 2010-01-25 | 2011-07-28 | Hitachi Displays, Ltd. | Liquid crystal display device and illuminating device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101054358B1 (en) * | 2009-03-26 | 2011-08-05 | 한울정보기술(주) | Emitting Capacitive Touch Sensor and Light Guide for Touch Sensor |
KR101028464B1 (en) * | 2009-06-24 | 2011-04-14 | 엘지이노텍 주식회사 | Keypad with a Light Guide Pad |
CN201489502U (en) * | 2009-08-13 | 2010-05-26 | 嘉兴淳祥电子科技有限公司 | Inductive element and light guide plate structure |
CN201548942U (en) * | 2009-11-16 | 2010-08-11 | 精元电脑股份有限公司 | Touch control keyboard improving device |
-
2012
- 2012-09-24 CN CN201210357317.1A patent/CN103672741A/en active Pending
- 2012-10-15 TW TW101138006A patent/TW201413770A/en unknown
-
2013
- 2013-06-11 US US13/914,833 patent/US20140085860A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070189040A1 (en) * | 2004-10-09 | 2007-08-16 | Chul-Goo Chi | Light guide plate for liquid crystal display back light units and liquid crystal display back light unit using the same |
US7466379B2 (en) * | 2005-02-14 | 2008-12-16 | Sony Corporation | Display apparatus |
US20080129701A1 (en) * | 2006-12-01 | 2008-06-05 | Takahiro Murakami | Input device equipped with illumination mechanism |
US20100321298A1 (en) * | 2009-06-17 | 2010-12-23 | Sunrex Technology Corp. | Keyboard and touchpad combination |
US20110181809A1 (en) * | 2010-01-25 | 2011-07-28 | Hitachi Displays, Ltd. | Liquid crystal display device and illuminating device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104917865A (en) * | 2015-06-08 | 2015-09-16 | 武汉华星光电技术有限公司 | Mobile terminal and display screen thereof |
US10698509B2 (en) | 2015-07-24 | 2020-06-30 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Display screen assembly, terminal front cover, and terminal |
US11941216B1 (en) * | 2023-05-09 | 2024-03-26 | Primax Electronics Ltd. | Touch pad with key input function |
Also Published As
Publication number | Publication date |
---|---|
TW201413770A (en) | 2014-04-01 |
CN103672741A (en) | 2014-03-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIH (HONG KONG) LIMITED, HONG KONG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WANG, YE;ZHANG, YONG-GANG;CHEN, KUAN-HUNG;REEL/FRAME:030587/0761 Effective date: 20130606 Owner name: SHENZHEN FUTAIHONG PRECISION INDUSTRY CO., LTD., C Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WANG, YE;ZHANG, YONG-GANG;CHEN, KUAN-HUNG;REEL/FRAME:030587/0761 Effective date: 20130606 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |